4 / 2 \ 3 2*x *\-1 - cot (x)/ + 8*x *cot(x)
2 / / 2 \ 2 / 2 \ \ 4*x *\6*cot(x) - 4*x*\1 + cot (x)/ + x *\1 + cot (x)/*cot(x)/
/ / 2 \ 3 / 2 \ / 2 \ 2 / 2 \ \ 4*x*\12*cot(x) - 18*x*\1 + cot (x)/ - x *\1 + cot (x)/*\1 + 3*cot (x)/ + 12*x *\1 + cot (x)/*cot(x)/